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-rw-r--r--arch/arm/mach-pxa/pxa3xx.c37
-rw-r--r--arch/arm/mm/consistent.c1
-rw-r--r--arch/x86/kernel/cpu/cpufreq/powernow-k8.c90
-rw-r--r--arch/x86/kernel/cpu/cpufreq/powernow-k8.h20
-rw-r--r--drivers/cpufreq/cpufreq_conservative.c153
5 files changed, 149 insertions, 152 deletions
diff --git a/arch/arm/mach-pxa/pxa3xx.c b/arch/arm/mach-pxa/pxa3xx.c
index 5da798282a54..61d9c9d69e6b 100644
--- a/arch/arm/mach-pxa/pxa3xx.c
+++ b/arch/arm/mach-pxa/pxa3xx.c
@@ -150,22 +150,45 @@ static void clk_pxa3xx_cken_disable(struct clk *clk)
local_irq_enable();
}
+static const struct clkops clk_pxa3xx_cken_ops = {
+ .enable = clk_pxa3xx_cken_enable,
+ .disable = clk_pxa3xx_cken_disable,
+};
+
static const struct clkops clk_pxa3xx_hsio_ops = {
.enable = clk_pxa3xx_cken_enable,
.disable = clk_pxa3xx_cken_disable,
.getrate = clk_pxa3xx_hsio_getrate,
};
+#define PXA3xx_CKEN(_name, _cken, _rate, _delay, _dev) \
+ { \
+ .name = _name, \
+ .dev = _dev, \
+ .ops = &clk_pxa3xx_cken_ops, \
+ .rate = _rate, \
+ .cken = CKEN_##_cken, \
+ .delay = _delay, \
+ }
+
+#define PXA3xx_CK(_name, _cken, _ops, _dev) \
+ { \
+ .name = _name, \
+ .dev = _dev, \
+ .ops = _ops, \
+ .cken = CKEN_##_cken, \
+ }
+
static struct clk pxa3xx_clks[] = {
- INIT_CK("LCDCLK", LCD, &clk_pxa3xx_hsio_ops, &pxa_device_fb.dev),
- INIT_CK("CAMCLK", CAMERA, &clk_pxa3xx_hsio_ops, NULL),
+ PXA3xx_CK("LCDCLK", LCD, &clk_pxa3xx_hsio_ops, &pxa_device_fb.dev),
+ PXA3xx_CK("CAMCLK", CAMERA, &clk_pxa3xx_hsio_ops, NULL),
- INIT_CKEN("UARTCLK", FFUART, 14857000, 1, &pxa_device_ffuart.dev),
- INIT_CKEN("UARTCLK", BTUART, 14857000, 1, &pxa_device_btuart.dev),
- INIT_CKEN("UARTCLK", STUART, 14857000, 1, NULL),
+ PXA3xx_CKEN("UARTCLK", FFUART, 14857000, 1, &pxa_device_ffuart.dev),
+ PXA3xx_CKEN("UARTCLK", BTUART, 14857000, 1, &pxa_device_btuart.dev),
+ PXA3xx_CKEN("UARTCLK", STUART, 14857000, 1, NULL),
- INIT_CKEN("I2CCLK", I2C, 32842000, 0, &pxa_device_i2c.dev),
- INIT_CKEN("UDCCLK", UDC, 48000000, 5, &pxa_device_udc.dev),
+ PXA3xx_CKEN("I2CCLK", I2C, 32842000, 0, &pxa_device_i2c.dev),
+ PXA3xx_CKEN("UDCCLK", UDC, 48000000, 5, &pxa_device_udc.dev),
};
void __init pxa3xx_init_irq(void)
diff --git a/arch/arm/mm/consistent.c b/arch/arm/mm/consistent.c
index cefdf2f9f26e..333a82a3717e 100644
--- a/arch/arm/mm/consistent.c
+++ b/arch/arm/mm/consistent.c
@@ -322,7 +322,6 @@ static int dma_mmap(struct device *dev, struct vm_area_struct *vma,
if (off < kern_size &&
user_size <= (kern_size - off)) {
- vma->vm_flags |= VM_RESERVED;
ret = remap_pfn_range(vma, vma->vm_start,
page_to_pfn(c->vm_pages) + off,
user_size << PAGE_SHIFT,
diff --git a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
index 9c36a53676b7..99e1ef9939be 100644
--- a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
+++ b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
@@ -46,7 +46,7 @@
#define PFX "powernow-k8: "
#define BFX PFX "BIOS error: "
-#define VERSION "version 2.00.00"
+#define VERSION "version 2.20.00"
#include "powernow-k8.h"
/* serialize freq changes */
@@ -73,33 +73,11 @@ static u32 find_khz_freq_from_fid(u32 fid)
return 1000 * find_freq_from_fid(fid);
}
-/* Return a frequency in MHz, given an input fid and did */
-static u32 find_freq_from_fiddid(u32 fid, u32 did)
+static u32 find_khz_freq_from_pstate(struct cpufreq_frequency_table *data, u32 pstate)
{
- if (current_cpu_data.x86 == 0x10)
- return 100 * (fid + 0x10) >> did;
- else
- return 100 * (fid + 0x8) >> did;
-}
-
-static u32 find_khz_freq_from_fiddid(u32 fid, u32 did)
-{
- return 1000 * find_freq_from_fiddid(fid, did);
-}
-
-static u32 find_fid_from_pstate(u32 pstate)
-{
- u32 hi, lo;
- rdmsr(MSR_PSTATE_DEF_BASE + pstate, lo, hi);
- return lo & HW_PSTATE_FID_MASK;
+ return data[pstate].frequency;
}
-static u32 find_did_from_pstate(u32 pstate)
-{
- u32 hi, lo;
- rdmsr(MSR_PSTATE_DEF_BASE + pstate, lo, hi);
- return (lo & HW_PSTATE_DID_MASK) >> HW_PSTATE_DID_SHIFT;
-}
/* Return the vco fid for an input fid
*
@@ -142,9 +120,7 @@ static int query_current_values_with_pending_wait(struct powernow_k8_data *data)
if (cpu_family == CPU_HW_PSTATE) {
rdmsr(MSR_PSTATE_STATUS, lo, hi);
i = lo & HW_PSTATE_MASK;
- rdmsr(MSR_PSTATE_DEF_BASE + i, lo, hi);
- data->currfid = lo & HW_PSTATE_FID_MASK;
- data->currdid = (lo & HW_PSTATE_DID_MASK) >> HW_PSTATE_DID_SHIFT;
+ data->currpstate = i;
return 0;
}
do {
@@ -295,7 +271,7 @@ static int decrease_vid_code_by_step(struct powernow_k8_data *data, u32 reqvid,
static int transition_pstate(struct powernow_k8_data *data, u32 pstate)
{
wrmsr(MSR_PSTATE_CTRL, pstate, 0);
- data->currfid = find_fid_from_pstate(pstate);
+ data->currpstate = pstate;
return 0;
}
@@ -845,17 +821,20 @@ err_out:
static int fill_powernow_table_pstate(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table)
{
int i;
+ u32 hi = 0, lo = 0;
+ rdmsr(MSR_PSTATE_CUR_LIMIT, hi, lo);
+ data->max_hw_pstate = (hi & HW_PSTATE_MAX_MASK) >> HW_PSTATE_MAX_SHIFT;
for (i = 0; i < data->acpi_data.state_count; i++) {
u32 index;
u32 hi = 0, lo = 0;
- u32 fid;
- u32 did;
index = data->acpi_data.states[i].control & HW_PSTATE_MASK;
- if (index > MAX_HW_PSTATE) {
+ if (index > data->max_hw_pstate) {
printk(KERN_ERR PFX "invalid pstate %d - bad value %d.\n", i, index);
printk(KERN_ERR PFX "Please report to BIOS manufacturer\n");
+ powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
+ continue;
}
rdmsr(MSR_PSTATE_DEF_BASE + index, lo, hi);
if (!(hi & HW_PSTATE_VALID_MASK)) {
@@ -864,22 +843,9 @@ static int fill_powernow_table_pstate(struct powernow_k8_data *data, struct cpuf
continue;
}
- fid = lo & HW_PSTATE_FID_MASK;
- did = (lo & HW_PSTATE_DID_MASK) >> HW_PSTATE_DID_SHIFT;
+ powernow_table[i].index = index;
- dprintk(" %d : fid 0x%x, did 0x%x\n", index, fid, did);
-
- powernow_table[i].index = index | (fid << HW_FID_INDEX_SHIFT) | (did << HW_DID_INDEX_SHIFT);
-
- powernow_table[i].frequency = find_khz_freq_from_fiddid(fid, did);
-
- if (powernow_table[i].frequency != (data->acpi_data.states[i].core_frequency * 1000)) {
- printk(KERN_INFO PFX "invalid freq entries %u kHz vs. %u kHz\n",
- powernow_table[i].frequency,
- (unsigned int) (data->acpi_data.states[i].core_frequency * 1000));
- powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
- continue;
- }
+ powernow_table[i].frequency = data->acpi_data.states[i].core_frequency * 1000;
}
return 0;
}
@@ -1020,22 +986,18 @@ static int transition_frequency_fidvid(struct powernow_k8_data *data, unsigned i
/* Take a frequency, and issue the hardware pstate transition command */
static int transition_frequency_pstate(struct powernow_k8_data *data, unsigned int index)
{
- u32 fid = 0;
- u32 did = 0;
u32 pstate = 0;
int res, i;
struct cpufreq_freqs freqs;
dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
- /* get fid did for hardware pstate transition */
+ /* get MSR index for hardware pstate transition */
pstate = index & HW_PSTATE_MASK;
- if (pstate > MAX_HW_PSTATE)
+ if (pstate > data->max_hw_pstate)
return 0;
- fid = (index & HW_FID_INDEX_MASK) >> HW_FID_INDEX_SHIFT;
- did = (index & HW_DID_INDEX_MASK) >> HW_DID_INDEX_SHIFT;
- freqs.old = find_khz_freq_from_fiddid(data->currfid, data->currdid);
- freqs.new = find_khz_freq_from_fiddid(fid, did);
+ freqs.old = find_khz_freq_from_pstate(data->powernow_table, data->currpstate);
+ freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate);
for_each_cpu_mask(i, *(data->available_cores)) {
freqs.cpu = i;
@@ -1043,9 +1005,7 @@ static int transition_frequency_pstate(struct powernow_k8_data *data, unsigned i
}
res = transition_pstate(data, pstate);
- data->currfid = find_fid_from_pstate(pstate);
- data->currdid = find_did_from_pstate(pstate);
- freqs.new = find_khz_freq_from_fiddid(data->currfid, data->currdid);
+ freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate);
for_each_cpu_mask(i, *(data->available_cores)) {
freqs.cpu = i;
@@ -1090,10 +1050,7 @@ static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsi
if (query_current_values_with_pending_wait(data))
goto err_out;
- if (cpu_family == CPU_HW_PSTATE)
- dprintk("targ: curr fid 0x%x, did 0x%x\n",
- data->currfid, data->currdid);
- else {
+ if (cpu_family != CPU_HW_PSTATE) {
dprintk("targ: curr fid 0x%x, vid 0x%x\n",
data->currfid, data->currvid);
@@ -1124,7 +1081,7 @@ static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsi
mutex_unlock(&fidvid_mutex);
if (cpu_family == CPU_HW_PSTATE)
- pol->cur = find_khz_freq_from_fiddid(data->currfid, data->currdid);
+ pol->cur = find_khz_freq_from_pstate(data->powernow_table, newstate);
else
pol->cur = find_khz_freq_from_fid(data->currfid);
ret = 0;
@@ -1223,7 +1180,7 @@ static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
+ (3 * (1 << data->irt) * 10)) * 1000;
if (cpu_family == CPU_HW_PSTATE)
- pol->cur = find_khz_freq_from_fiddid(data->currfid, data->currdid);
+ pol->cur = find_khz_freq_from_pstate(data->powernow_table, data->currpstate);
else
pol->cur = find_khz_freq_from_fid(data->currfid);
dprintk("policy current frequency %d kHz\n", pol->cur);
@@ -1240,8 +1197,7 @@ static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu);
if (cpu_family == CPU_HW_PSTATE)
- dprintk("cpu_init done, current fid 0x%x, did 0x%x\n",
- data->currfid, data->currdid);
+ dprintk("cpu_init done, current pstate 0x%x\n", data->currpstate);
else
dprintk("cpu_init done, current fid 0x%x, vid 0x%x\n",
data->currfid, data->currvid);
@@ -1297,7 +1253,7 @@ static unsigned int powernowk8_get (unsigned int cpu)
goto out;
if (cpu_family == CPU_HW_PSTATE)
- khz = find_khz_freq_from_fiddid(data->currfid, data->currdid);
+ khz = find_khz_freq_from_pstate(data->powernow_table, data->currpstate);
else
khz = find_khz_freq_from_fid(data->currfid);
diff --git a/arch/x86/kernel/cpu/cpufreq/powernow-k8.h b/arch/x86/kernel/cpu/cpufreq/powernow-k8.h
index 7c4f6e0faed4..afd2b520d35c 100644
--- a/arch/x86/kernel/cpu/cpufreq/powernow-k8.h
+++ b/arch/x86/kernel/cpu/cpufreq/powernow-k8.h
@@ -10,6 +10,7 @@ struct powernow_k8_data {
u32 numps; /* number of p-states */
u32 batps; /* number of p-states supported on battery */
+ u32 max_hw_pstate; /* maximum legal hardware pstate */
/* these values are constant when the PSB is used to determine
* vid/fid pairings, but are modified during the ->target() call
@@ -21,8 +22,8 @@ struct powernow_k8_data {
u32 plllock; /* pll lock time, units 1 us */
u32 exttype; /* extended interface = 1 */
- /* keep track of the current fid / vid or did */
- u32 currvid, currfid, currdid;
+ /* keep track of the current fid / vid or pstate */
+ u32 currvid, currfid, currpstate;
/* the powernow_table includes all frequency and vid/fid pairings:
* fid are the lower 8 bits of the index, vid are the upper 8 bits.
@@ -87,23 +88,14 @@ struct powernow_k8_data {
/* Hardware Pstate _PSS and MSR definitions */
#define USE_HW_PSTATE 0x00000080
-#define HW_PSTATE_FID_MASK 0x0000003f
-#define HW_PSTATE_DID_MASK 0x000001c0
-#define HW_PSTATE_DID_SHIFT 6
#define HW_PSTATE_MASK 0x00000007
#define HW_PSTATE_VALID_MASK 0x80000000
-#define HW_FID_INDEX_SHIFT 8
-#define HW_FID_INDEX_MASK 0x0000ff00
-#define HW_DID_INDEX_SHIFT 16
-#define HW_DID_INDEX_MASK 0x00ff0000
-#define HW_WATTS_MASK 0xff
-#define HW_PWR_DVR_MASK 0x300
-#define HW_PWR_DVR_SHIFT 8
-#define HW_PWR_MAX_MULT 3
-#define MAX_HW_PSTATE 8 /* hw pstate supports up to 8 */
+#define HW_PSTATE_MAX_MASK 0x000000f0
+#define HW_PSTATE_MAX_SHIFT 4
#define MSR_PSTATE_DEF_BASE 0xc0010064 /* base of Pstate MSRs */
#define MSR_PSTATE_STATUS 0xc0010063 /* Pstate Status MSR */
#define MSR_PSTATE_CTRL 0xc0010062 /* Pstate control MSR */
+#define MSR_PSTATE_CUR_LIMIT 0xc0010061 /* pstate current limit MSR */
/* define the two driver architectures */
#define CPU_OPTERON 0
diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c
index 4bd33ce8a6f3..1bba99747f5b 100644
--- a/drivers/cpufreq/cpufreq_conservative.c
+++ b/drivers/cpufreq/cpufreq_conservative.c
@@ -37,17 +37,17 @@
#define DEF_FREQUENCY_UP_THRESHOLD (80)
#define DEF_FREQUENCY_DOWN_THRESHOLD (20)
-/*
- * The polling frequency of this governor depends on the capability of
+/*
+ * The polling frequency of this governor depends on the capability of
* the processor. Default polling frequency is 1000 times the transition
- * latency of the processor. The governor will work on any processor with
- * transition latency <= 10mS, using appropriate sampling
+ * latency of the processor. The governor will work on any processor with
+ * transition latency <= 10mS, using appropriate sampling
* rate.
* For CPUs with transition latency > 10mS (mostly drivers
* with CPUFREQ_ETERNAL), this governor will not work.
* All times here are in uS.
*/
-static unsigned int def_sampling_rate;
+static unsigned int def_sampling_rate;
#define MIN_SAMPLING_RATE_RATIO (2)
/* for correct statistics, we need at least 10 ticks between each measure */
#define MIN_STAT_SAMPLING_RATE \
@@ -63,12 +63,12 @@ static unsigned int def_sampling_rate;
static void do_dbs_timer(struct work_struct *work);
struct cpu_dbs_info_s {
- struct cpufreq_policy *cur_policy;
- unsigned int prev_cpu_idle_up;
- unsigned int prev_cpu_idle_down;
- unsigned int enable;
- unsigned int down_skip;
- unsigned int requested_freq;
+ struct cpufreq_policy *cur_policy;
+ unsigned int prev_cpu_idle_up;
+ unsigned int prev_cpu_idle_down;
+ unsigned int enable;
+ unsigned int down_skip;
+ unsigned int requested_freq;
};
static DEFINE_PER_CPU(struct cpu_dbs_info_s, cpu_dbs_info);
@@ -82,24 +82,24 @@ static unsigned int dbs_enable; /* number of CPUs using this policy */
* cpu_hotplug lock should be taken before that. Note that cpu_hotplug lock
* is recursive for the same process. -Venki
*/
-static DEFINE_MUTEX (dbs_mutex);
+static DEFINE_MUTEX (dbs_mutex);
static DECLARE_DELAYED_WORK(dbs_work, do_dbs_timer);
struct dbs_tuners {
- unsigned int sampling_rate;
- unsigned int sampling_down_factor;
- unsigned int up_threshold;
- unsigned int down_threshold;
- unsigned int ignore_nice;
- unsigned int freq_step;
+ unsigned int sampling_rate;
+ unsigned int sampling_down_factor;
+ unsigned int up_threshold;
+ unsigned int down_threshold;
+ unsigned int ignore_nice;
+ unsigned int freq_step;
};
static struct dbs_tuners dbs_tuners_ins = {
- .up_threshold = DEF_FREQUENCY_UP_THRESHOLD,
- .down_threshold = DEF_FREQUENCY_DOWN_THRESHOLD,
- .sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR,
- .ignore_nice = 0,
- .freq_step = 5,
+ .up_threshold = DEF_FREQUENCY_UP_THRESHOLD,
+ .down_threshold = DEF_FREQUENCY_DOWN_THRESHOLD,
+ .sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR,
+ .ignore_nice = 0,
+ .freq_step = 5,
};
static inline unsigned int get_cpu_idle_time(unsigned int cpu)
@@ -109,13 +109,34 @@ static inline unsigned int get_cpu_idle_time(unsigned int cpu)
if (dbs_tuners_ins.ignore_nice)
add_nice = kstat_cpu(cpu).cpustat.nice;
- ret = kstat_cpu(cpu).cpustat.idle +
+ ret = kstat_cpu(cpu).cpustat.idle +
kstat_cpu(cpu).cpustat.iowait +
add_nice;
return ret;
}
+/* keep track of frequency transitions */
+static int
+dbs_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
+ void *data)
+{
+ struct cpufreq_freqs *freq = data;
+ struct cpu_dbs_info_s *this_dbs_info = &per_cpu(cpu_dbs_info,
+ freq->cpu);
+
+ if (!this_dbs_info->enable)
+ return 0;
+
+ this_dbs_info->requested_freq = freq->new;
+
+ return 0;
+}
+
+static struct notifier_block dbs_cpufreq_notifier_block = {
+ .notifier_call = dbs_cpufreq_notifier
+};
+
/************************** sysfs interface ************************/
static ssize_t show_sampling_rate_max(struct cpufreq_policy *policy, char *buf)
{
@@ -127,8 +148,8 @@ static ssize_t show_sampling_rate_min(struct cpufreq_policy *policy, char *buf)
return sprintf (buf, "%u\n", MIN_SAMPLING_RATE);
}
-#define define_one_ro(_name) \
-static struct freq_attr _name = \
+#define define_one_ro(_name) \
+static struct freq_attr _name = \
__ATTR(_name, 0444, show_##_name, NULL)
define_one_ro(sampling_rate_max);
@@ -148,7 +169,7 @@ show_one(down_threshold, down_threshold);
show_one(ignore_nice_load, ignore_nice);
show_one(freq_step, freq_step);
-static ssize_t store_sampling_down_factor(struct cpufreq_policy *unused,
+static ssize_t store_sampling_down_factor(struct cpufreq_policy *unused,
const char *buf, size_t count)
{
unsigned int input;
@@ -164,7 +185,7 @@ static ssize_t store_sampling_down_factor(struct cpufreq_policy *unused,
return count;
}
-static ssize_t store_sampling_rate(struct cpufreq_policy *unused,
+static ssize_t store_sampling_rate(struct cpufreq_policy *unused,
const char *buf, size_t count)
{
unsigned int input;
@@ -183,7 +204,7 @@ static ssize_t store_sampling_rate(struct cpufreq_policy *unused,
return count;
}
-static ssize_t store_up_threshold(struct cpufreq_policy *unused,
+static ssize_t store_up_threshold(struct cpufreq_policy *unused,
const char *buf, size_t count)
{
unsigned int input;
@@ -202,7 +223,7 @@ static ssize_t store_up_threshold(struct cpufreq_policy *unused,
return count;
}
-static ssize_t store_down_threshold(struct cpufreq_policy *unused,
+static ssize_t store_down_threshold(struct cpufreq_policy *unused,
const char *buf, size_t count)
{
unsigned int input;
@@ -228,16 +249,16 @@ static ssize_t store_ignore_nice_load(struct cpufreq_policy *policy,
int ret;
unsigned int j;
-
- ret = sscanf (buf, "%u", &input);
- if ( ret != 1 )
+
+ ret = sscanf(buf, "%u", &input);
+ if (ret != 1)
return -EINVAL;
- if ( input > 1 )
+ if (input > 1)
input = 1;
-
+
mutex_lock(&dbs_mutex);
- if ( input == dbs_tuners_ins.ignore_nice ) { /* nothing to do */
+ if (input == dbs_tuners_ins.ignore_nice) { /* nothing to do */
mutex_unlock(&dbs_mutex);
return count;
}
@@ -261,14 +282,14 @@ static ssize_t store_freq_step(struct cpufreq_policy *policy,
unsigned int input;
int ret;
- ret = sscanf (buf, "%u", &input);
+ ret = sscanf(buf, "%u", &input);
- if ( ret != 1 )
+ if (ret != 1)
return -EINVAL;
- if ( input > 100 )
+ if (input > 100)
input = 100;
-
+
/* no need to test here if freq_step is zero as the user might actually
* want this, they would be crazy though :) */
mutex_lock(&dbs_mutex);
@@ -322,18 +343,18 @@ static void dbs_check_cpu(int cpu)
policy = this_dbs_info->cur_policy;
- /*
- * The default safe range is 20% to 80%
+ /*
+ * The default safe range is 20% to 80%
* Every sampling_rate, we check
- * - If current idle time is less than 20%, then we try to
- * increase frequency
+ * - If current idle time is less than 20%, then we try to
+ * increase frequency
* Every sampling_rate*sampling_down_factor, we check
- * - If current idle time is more than 80%, then we try to
- * decrease frequency
+ * - If current idle time is more than 80%, then we try to
+ * decrease frequency
*
- * Any frequency increase takes it to the maximum frequency.
- * Frequency reduction happens at minimum steps of
- * 5% (default) of max_frequency
+ * Any frequency increase takes it to the maximum frequency.
+ * Frequency reduction happens at minimum steps of
+ * 5% (default) of max_frequency
*/
/* Check for frequency increase */
@@ -361,13 +382,13 @@ static void dbs_check_cpu(int cpu)
/* if we are already at full speed then break out early */
if (this_dbs_info->requested_freq == policy->max)
return;
-
+
freq_step = (dbs_tuners_ins.freq_step * policy->max) / 100;
/* max freq cannot be less than 100. But who knows.... */
if (unlikely(freq_step == 0))
freq_step = 5;
-
+
this_dbs_info->requested_freq += freq_step;
if (this_dbs_info->requested_freq > policy->max)
this_dbs_info->requested_freq = policy->max;
@@ -427,15 +448,15 @@ static void dbs_check_cpu(int cpu)
}
static void do_dbs_timer(struct work_struct *work)
-{
+{
int i;
mutex_lock(&dbs_mutex);
for_each_online_cpu(i)
dbs_check_cpu(i);
- schedule_delayed_work(&dbs_work,
+ schedule_delayed_work(&dbs_work,
usecs_to_jiffies(dbs_tuners_ins.sampling_rate));
mutex_unlock(&dbs_mutex);
-}
+}
static inline void dbs_timer_init(void)
{
@@ -462,13 +483,12 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
switch (event) {
case CPUFREQ_GOV_START:
- if ((!cpu_online(cpu)) ||
- (!policy->cur))
+ if ((!cpu_online(cpu)) || (!policy->cur))
return -EINVAL;
if (this_dbs_info->enable) /* Already enabled */
break;
-
+
mutex_lock(&dbs_mutex);
rc = sysfs_create_group(&policy->kobj, &dbs_attr_group);
@@ -481,7 +501,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
struct cpu_dbs_info_s *j_dbs_info;
j_dbs_info = &per_cpu(cpu_dbs_info, j);
j_dbs_info->cur_policy = policy;
-
+
j_dbs_info->prev_cpu_idle_up = get_cpu_idle_time(cpu);
j_dbs_info->prev_cpu_idle_down
= j_dbs_info->prev_cpu_idle_up;
@@ -511,8 +531,11 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
dbs_tuners_ins.sampling_rate = def_sampling_rate;
dbs_timer_init();
+ cpufreq_register_notifier(
+ &dbs_cpufreq_notifier_block,
+ CPUFREQ_TRANSITION_NOTIFIER);
}
-
+
mutex_unlock(&dbs_mutex);
break;
@@ -525,9 +548,13 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
* Stop the timerschedule work, when this governor
* is used for first time
*/
- if (dbs_enable == 0)
+ if (dbs_enable == 0) {
dbs_timer_exit();
-
+ cpufreq_unregister_notifier(
+ &dbs_cpufreq_notifier_block,
+ CPUFREQ_TRANSITION_NOTIFIER);
+ }
+
mutex_unlock(&dbs_mutex);
break;
@@ -537,11 +564,11 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
if (policy->max < this_dbs_info->cur_policy->cur)
__cpufreq_driver_target(
this_dbs_info->cur_policy,
- policy->max, CPUFREQ_RELATION_H);
+ policy->max, CPUFREQ_RELATION_H);
else if (policy->min > this_dbs_info->cur_policy->cur)
__cpufreq_driver_target(
this_dbs_info->cur_policy,
- policy->min, CPUFREQ_RELATION_L);
+ policy->min, CPUFREQ_RELATION_L);
mutex_unlock(&dbs_mutex);
break;
}
generated by cgit v1.2.3 (git 2.0.4) at 2024-05-10 20:28:33 +0000